Cutter head



4 1,634,494 J y 1927' F. 'r. FLINCHBAUGH CUTTER HEAD Filed June 9, 1924 Patented July 5, 1927;

UNITED STATES FREDERICK T. FLINCHBAUGH, OF YORK, PENNSYLVA'NTA, ASSIG'NOR,

TO FLINCHBAUGH MACHINE COMPANY, ENCORPORATED.

SIGNMENTS,

restate PATENT OFFICE.

BY Mnsnn AS- GUTTER HEAD.

Application filed June 9, 1924. Serial No. 718,928.

This invention relates to an improved cutter head for reboring machines, being particularly designed for use in conjunction with cylinder reboring machines of the character disclosed inv my application No. 504,286, filed September 30, 1921 and allowed December 12, 1923.

The invention seeks as one of its principal objects to provide a cutter head wherein the cutters are adjusted by means rigidly supported on the boring bar independently of the head, so that the head may be out of alinement with the boring bar without affecting the position of the cutters relative to the bar or to each other.

A further object of the invention is to provide a cutter head wherein the cutters may be adjusted from the outer end of the head.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a vertical sect-ion through my improved cutter head and bar,

igure 2, a horizontal section on the line 22 of Figure 1, looking in the direction of the arrows,

Figure 3 is a perspective view of one of the cutters in detail, and

Figure 4, a detail perspective of the adjusting key employed.

In the drawings reference character 10 indicates a cylindrical body having a stepped hub 11. A bore 12 extends axially through the hub and the body to receive a boring bar 18 which is provided at its lower end with a nipple 14 threaded for a portion of its length to engage with threads on the interior of the hub and having a shoulderat 14E abutting against the end of the hub.

Cutter heads of the general type of my invention mounted on boring bars in substantially similar manner to what is above described have heretofore been known in the art. A frequent cause of diflicult-y in the use of such boring bars has been that a head sometimes gets out of alinement with the bar supporting it, one of the principal reasons for such want of alinement being that dirt enters between the shoulder 14 and the end of the hub 11 when the head is detached from the bar. When the head is again screwed down to place such dirt if found at one side only will tend to a little to the opposite side. The expanding means for the blades is usually carried by the head and if the head should be out of alinement as above described the cut-tors will still be adjustable relatively to the head and will therefore not be true relatively to the bar, that is to say the circle formed by the outer or cutting faces on the cutters will not be concentric with the axis of the boring bar and imperfect work will result.

To obviate such difficulty I have provided adjusting means carried by the bar and rigidly secured to the bar in axial relation thereto so that the adjustment of the cutters will always be equal in all directions from the axis. The adjusting means is located in a socket 15 of the bar and includes a head or spreader 16 preferably in the form of a cone projecting from said socket into engagement with bevel faces 17 on the cutters 17' which are held in place on the end face of the body 10 by a bottom ring 18 secured to the head by screws 19 which, as shown in Figure 2, are preferably arranged in a circle on the head midwa-y between adjacent pairs of cutters. The heads of the screws are countersunk in the ring and may be adjusted so as to clamp the ring against the cutters thereby holding them securely in place. For further securing the cutters in place I have provided a set screw 20 for each cutter, the set screw being located at right angles to the cutter and adapted to engage one side of the same. The set screws are threaded throughout their length and engage in horizonta threaded openings of the head 10.

The cone 16 is carried by a hollow shank 22 fitting closely in a socket 15 and is preferably integral therewith. This fit is much tighter than a running fit, although not so close as a driving fit. It might be described as a push fit being as firm as possible without preventing its movement by the powerful screw threads on plug 2 1. Needless to say it is free from all side wabble. The part here shown as forms but will ordinarily inclined faces acting as adjusting means for moving the cutters radially outward. The head and the shank making up the cutter adjusting means are here shown as having a be provided with throw the head .i:

a cone may have various 7 described in the bore 23 extending from end to end thereof,

said bore being threaded throughout thev greater part of its length. A threaded plug 24 is located in the threaded portion of the bore, said plug providing means for adjusting the shank longitudinally of the socket as will be obvious from consideration of Figure 1. For this purpose a hexagonal key 25 is inserted through the bore 23 into a hexagonal socket 26 in the plug 24 and rotated thereby turning the plug relatively to the shank.

It will be obvious to those skilled in the art that my device may be modified in various Ways Without departing from the spirit of the invention and therefore 1 do not limit myself to What is shown in the drawings and specification but only as indicated in the appended claim. It Will also be obvious that the principle 01 my invention may be employed in other situations than that illustrated and described.

Having thus fully described my said invention, What I claim as new and desire to secure by Letters Patent is:

The combination of a boring bar having an annular outer shoulder and an axial bore, a cutter head in threaded engagement with the reduced portion of the bar andhaving a radial flange at its"outer ranged in radial slots in said flange, a removable end plate hearing on said cutters for clamping them in place, clamping screws entered in said head at right angles to said cutters, a conical head bearing against inclined faces at the under sides of said'out ters said head having an elongated internally-threaded shank in said axial bore, and a screw plug in said shank bearing at its inner end against the bottom of said bore, subsantially as set forth. 7 i

In Witness whereof, I have hereunto set my hand at VVaynesboro, Pennsylvania, this 5th day of June, A. twenty-fou1a FREDERICK T. FLINCHBAUGH;

end, cutters ar- I D. nineteen hundred and 

